@m_callum said:
API Token no longer works
Hi all,
I am just getting back into using the API again and can no longer authenticate using my API token.
Whenever I try and auth using my API token I get the following response:

{"status_code":7,"status_message":"Invalid API key: You must be granted a valid key.","success":false}

The request I am making is:

curl --request GET \
     --url https://api.themoviedb.org/3/authentication \
     --header 'Authorization: Bearer xxxxxxxxx' \ 
     --header 'accept: application/json'

This request was copied directly from the API docs, it works with my access token but not API token. The requests in the API docs also do not work

I'd be grateful for some help.

The "Try it!" option in DOCs it only works with the "Access Token Auth" option.
It doesn't work if you select the "API Key Auth" option.
Your API Key validation test is done using your Token.
https://developer.themoviedb.org/reference/authentication-validate-key
If your Token works then your API Key must also work.
If you want to test your API Key directly, follow the instructions below.

Take a Test
Using a computer, desktop or notebook.
On some mobile devices this test may not work correctly.
In the URL below, change THE_KEY to your API Key.
https://api.themoviedb.org/3/movie/550?api_key=THE_KEY
Use this example to do a search using a new tab or window in your browser.
You will receive the basic data of the Movie Fight Club (1999)
https://www.themoviedb.org/movie/550-fight-club
If it works, your Key is OK.

When there is a problem, the TMDb Server sends a message.
Can you tell which message the server sent?
Here is a list of possible messages:
https://developer.themoviedb.org/docs/errors

If it does not work, let us know right here.

It works but why would my API key auth stop working?

@m_callum said:

It works but why would my API key auth stop working?

I'm not a programmer and I don't understand anything about CURL.
I believe there is no API Key Authentication.
If in a common API Request, without using CURL, your Key is not valid, you will receive an error response.
But it's better to wait for someone who understands the subject to give you an answer.